Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands |
Dec. 31, 2019 |
Oct. 01, 2019 |
Sep. 30, 2019 |
|---|---|---|---|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Accumulated deficit | $ (210,160) | $ (209,340) | |
| Operating lease liability recognized upon ASU adoption | $ 2,288 | ||
| Accounting Standards Update 2016-02 | |||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Operating lease liability recognized upon ASU adoption | $ 2,600 |